Here is the free copy of the Book "Desiring God" by John Piper in PDF form. 

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Originally published in 1986 by theologian and pastor John Piper, Desiring God: Meditations of a Christian Hedonist is a foundational work of modern Reformed theology. The book's central premise introduces a concept Piper calls "Christian Hedonism," which he famously summarizes in a single paradigm-shifting phrase:

"God is most glorified in us when we are most satisfied in him."

Piper argues that the traditional tension between our duty to glorify God and our desire to be happy is a false dichotomy. Instead, pursuing maximum joy in God is an absolute moral necessity, because finding pleasure in anything less than God is the very definition of sin.

The book explores how this pursuit of joy in God completely transforms various aspects of the Christian life:

1. The Foundation of Christian Hedonism

The Sovereign Pleasures of God: Piper establishes that God Himself is the ultimate hedonist because He takes supreme delight in His own glory, perfection, and creation.

The Mandate for Joy: Seeking happiness is not a sinful luxury; it is a command. Piper asserts that true worship, faith, and love cannot exist without a genuine heart-level desire and delight in God. Doing "good deeds" out of mere begrudging duty actually insults God by implying He is not satisfying enough to motivate us.

2. The Conversion and Mind of a Hedonist

The New Birth: True conversion is described as a supernatural awakening of spiritual tastebuds. A Christian is someone whose deepest desires have been fundamentally altered to treasure God above all earthly comforts.

The Role of the Mind: Piper clarifies that Christian Hedonism is not an anti-intellectual emotionalism. The mind must think clearly and deeply about biblical truth to fuel the heart's passions. Right thinking about God exists to serve right feeling about God.

3. Practical Expressions of Worship and Devotion

Piper systematically applies the pursuit of joy to the foundational disciplines of the Christian faith:

Worship: True worship is not a formal ritual or an act of willpower; it is the natural, joyful overflow of a heart that treasures God.

Prayer: Prayer is designed to highlight God’s ultimate wealth and our ultimate need. When we ask God for help and joyfully receive it, He gets the glory as the all-sufficient Giver, and we get the satisfaction as the receivers.

The Word: Bible study is framed as a literal "quest for joy." Scripture is the primary tool used to renew our minds and keep our spiritual desires locked onto God rather than the fleeting pleasures of the world.

4. Radical Lifestyle Implications

Money and Giving: Christian Hedonists are freed from the trap of materialism. They give generously and live simply, not because they are supposed to, but because they find far greater joy in using wealth to advance God's kingdom than in hoarding temporary possessions.

Love and Ministry: True love for others is defined as the endeavor to include them in our satisfaction in God. When we sacrifice for others, we are not sacrificing our ultimate joy; we are expanding it by sharing the ultimate source of happiness with them.

Suffering: Piper addresses the reality of pain, arguing that remaining satisfied in God through intense suffering and persecution proves to the world that God is more valuable than life itself.

In short: Desiring God turns conventional views of religious duty on their head. It challenges believers to abandon the exhausting grind of "empty legalism" and instead relentlessly pursue their highest, everlasting joy in the presence and character of God.